@import "./common.scss";//导入的语法不用url 直接用双引号

body{
    button{
        color: $error;
        @include border-radius;//解决浏览器兼容性问题
        @include border(2px,solid,red);
    }

    ul{
        @include h-ul;
        @include border($w:2px,$s:dotted,$c:red);//命名参数 顺序可以打乱
    }

    //继承
    div{
        border: 1ps solid red;
    }

    span{
        @extend div;
        font-size: 20px
    }

}